\begin{tikzpicture}
    \tkzDefPoints{0/0/A, 3/0/B, 2.2/1.5/O}
    \tkzDefPointOnLine[pos=1.5](A,O)  \tkzGetPoint{A'}
    \tkzDefPointOnLine[pos=1.5](B,O)  \tkzGetPoint{B'}

    \tkzDrawPolygon(O,A,B)
    \tkzDrawPolygon(O,A',B')
    \tkzLabelPoints[left=.5em](O)
    \tkzLabelPoints[left](A,B')
    \tkzLabelPoints[right](B,A')
\end{tikzpicture}

